Harrow-tooth.



PATENTED FEB. 6, 1906 J. M. ULSH.

HARROW TOOTH.

APPLICATION nun JULY 29. moa.

UNITED T OFFICE.

HAFIROW-TOOTH.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Application filed July 29, 1905- Scrial R0. 271,802.

To all whom, it m. concern:

Be it known that 1, JAMES M. ULSH, a citizen of the United States,residing at Lancaster, in the county of Lancaster and State ofPennsylvania, have invented a new and useful Harrow-Tooth, of which thefollowing is a specification.

The invention relates to improvements in barrow-teeth.

The object of the present invention is to improve the construction ofharrow-tceth and to shorten the length, and thereby lessen the cost, ofharrow-t-eeth without impairing their efliciency.

A further objectof the invention is to render the tooth more rigid, andthereby increase its efficiency as a cultivator or pulverizer.

Also the invention has for its object to prevent the strain on the toothfrom bein exerted directly against the head of thebo t for seeurin thetooth to the tooth-bar and to arran e t e arts so that the strain willoperate to orce t e tooth firml against the toothbar and will be partlyorne by the latter, ghiireby materially relieving the attachingFurthermore, it is the object of the invention to arrange the tooth andthe bolt so that the strain on the latter will be transversely thereofand not directly outward against the head of the bolt, whereby the headof the bolt will be prevented from being pulled off by the tooth.

Another obect of the invention is to arrange the teet so that when theyare thrown upward out of the ground to clean the harrow no ortion ofthem will be depressed and tend to old in the harrow any accumulatedrubbish, whereby the harrow will be more easily cleaned than a harrowhaving the long spring-teeth, which extend both in advance and in rearof the tooth-bar and which are partly depressed when the points of theteeth are thrown upward and forward.

With these and other objects in view the invention consists in theconstruction and novel combination and arran ement of parts hereinafterfully described, ii ustrated in the accompanying drawings, and pointedout in the claims hereto appended, it being understood that variouschanges in the form, proportion, size, and minor details of constructionwithin the scope of the claims may be resorted to without'departing fromthe spirit or sacrificing any of the advantages of t e invention.

In the drawings, Figure 1 is a perspective view of a barrow toothconstructed in accordance with this invention. Fig. 2 is a sideelevation, partly in section. Fig. 3 is a transverse sectional view onthe line 3 3 of Fig. 2.

Like numerals of referencedesignate corresponding parts in all thefigures of the drawmgs.

1 designates a barrow-tooth which has its top portion sigmoidally bentto form an a proximately horizontal compound curve, t e

ront portion 2 of the curve presenting a con cave upper face to conformto the configuration of a tooth-bar 3. The front portion 2 of the top ofthe tooth is arranged beneath the tooth-bar, and the rear portion 4 ofthe sigmoidal portion presents a convex u per face and extends upward atthe back of t e toothbar. The harrow tooth, which is much shorter thanthe ordinary spring harrowtooth, is consequently less expensive, and inorder to compensate for the increased length of the ordinary springbarrow-tooth a brace 5 is rovided, which renders the tooth more rigi andincreases the efficiency of the same as a cultivator or pulverizer. Thefront portion of the brace, which is arranged on the back of the tooth,is sigmoidally bent to provide a substantially horizontal com poundcurve to fit the compound curve of the to of the tooth, and the frontportion 6 of t e brace presents a concave upper face'and is fitteddirectly against the lower front portion and the bottom of the toothbar3, The rear portion of the brace presents a convex up or face, and itextends upward at the bee of the tooth-bar. The lower rear portion ofthe brace extends downward at the back of the tooth, terminating shortof and adjacent to the center of the tooth; but the brace may be variedin length to secure the requisite stiifness or rigidity of the tooth.

The tooth and the brace are of the same width, and the tooth-bar, whichis preferably tubular and round, as shown, is ierced by a bolt 7, whichis arranged at an inc ination and which extends upwardly and rearwardlythrough the front portions of the tooth and the brace. The head of thebolt is at the lower end, and the upper end of the bolt is arranged atthe upper portion of the back of the tooth-bar and is threaded for thereception of a nut 8. The tooth is regularly curved in -rear of theupper sigmoidally-bent portion,

and the lower portion of the bod r of the tooth curves downward] andforwar ly, and when pressure is applied to the point of the tooth theupper curved ortions of the tooth and the brace are force firml againstthe toothbar at the bottom and t 1e back, the tooth bar therebyoperating to relieve the bolt of a portion of the strain. Also thestrain on the bolt is transversely of the same and is not exertedoutwardly or downwardly directly against the head of the bolt and thereis not the liability to ull off the head of the bolt, as is the case Wien the teeth are attached at the top of the tooth-bar, and the strainis directly against and borne solely by the head of the bolt. Also bysecuring the top portion of the harrow-tooth beneath the tooth bar andextending the tooth rearwardly and downwardly no portion of the toothwill be depressed when the tooth is withdrawn or swung upward and therewill be no tendency to hold in the harrow any accumulated rubbish, as isthe case when harrow-teeth are secured to the top of the toothbar andare curved forwardly to a point considerably in advance of the tooth-barin forming a large spring loop or curve, since the front portion of suchtooth is depressed and will tend to hold in the harrow any accumulatedrubbish when the points of the tooth are thrown upward.

It will be seen that the barrow-tooth is simple, strong, and durable,that by the present invention the cost of constructing harrowteeth isgreatly lessened and their efficiency as cultivators or pulverizers isincreased and that they are securely fastened to the toothbar. Also itwill be clear that the tooth-bar is adapted to sustain a portion of thestrain, and thereby relieve the bolt of considerable strain, and thatthe strain on the bolt is transversely thereof and not directly againstthe head of the same.

Having thus fully described my invention, what I claim as new, anddesireto secure by Letters Patent, is

1. The combination with a tooth-bar, of a harrow-tooth having its toportion arranged beneath the tooth-bar wit the terminal extended u wardat the front of the said bar, said toot being extended rearwardly anddownwardly from the tooth-bar, and an inclined fastening device piercingthe tooth-bar and the top portion of the harroW-tooth and extending fromthe back of the u per portion of the tooth-bar to the lower ont portionthereof and having its lower end arranged at the front of the terminalof the upper portion of the barrow-tooth at a point in advance of thebottom of the tooth bar, whereby when pressure is applied to the pointof the tooth, the entire strain will be against the bottom of the toothbar and transversely of the fastening device.

2. The combination with a tooth-bar, of a harrow-tooth having its topportion sigmoidally bent into substantially a horizontal compound curve,the front portion of the curve presenting a concave up er face and lyingbeneath the tooth-bar anal extending upward. at the front of the same,and an inverted inclined fastening device piercing the tooth-bar and theharrow tooth and extending from the back of the upper portion of thetoothbar to the lower portion of the front of the same, the head of thebolt being arranged at the front of the upwardly-extending terminal ofthe top portion of the harrow-tooth and at a point in advance of thebottom of the toothbar, whereby when the oint of the tooth is subjectedto pressure, tl ie entire strain will be against the bottom of thetoothbar and transversely of the bolt.

3. The combination with a tooth-bar, of a harrow-tooth having its topportion sigmoidally bent into substantially a horizontal compound curve,the front portion of the curve resenting a concave up er face and lyineneath t 1e tooth-bar an extending upward at the front of the same, andan inverted inclined fastening device piercing the toothbar and theharrow-tooth and extending from the back of the upper portion of thetoothbar to the lower portion of the front of the same, the head of thebolt being arranged at the front of the upwardly-extending terminal ofthe top portion of the barrow-tooth and at a point in advance of thebottom of the toothbar, whereby when the point of the tooth is subjectedto ressure, the entire strain will be against the ottom of the toothbarand transversely of the bolt, and a brace provided with asigmoidally-bent top portion conforming to the configuration of thebarrow-tooth and fitted against the back and upper face of the topportion of the same and secured to the harrow-tooth and to the tooth-barby the said bolt.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JAMES M. ULSH.

Witnesses:

E. M. HARTMAN, MILTON H. HARTMAN.

